The Aviationist on MSN
New photos raise questions about China's coaxial-rotor helicopter knockoff
New images recently emerged raise the possibility that China has built another compound helicopter demonstrator, following ...
Found and Explained Official on MSN
Why the SB-1 Defiant lost the Army helicopter contract
The Sikorsky Boeing SB-1 Defiant combined coaxial rotors and a pusher propeller to achieve high speed and stability. Despite ...
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